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  1. This post covers two topics: charge balance and slide. Charge balance: I have tried a very simple solution pH 9, SiO2(aq) 1 mmol, precip on, suppress all, unsuppress SiO2(am) [i'm using the LLNL database]. When i run the solution in REACT or SPECI8, I get the message that the charge balance can not be determined because Cl is not in the input solution despite the solution being anion rich. Putting Cl in with it as charge balance gives the expected overload. Putting Na in gives me the same error but with Na as the problem. I have tried sneaking up on the solution by using no charge balance and determining the amount of cation (Na in this case) needed to get close to charge balance. With that amount of Na with charge balance gives me the same error. So, there is something I'm overlooking...but what? Slide: Ive tried to slide SiO2(aq) in the above and similar solutions only to be greeted with the error message "Exit: React stop: passem: bad basloc call" What is would like to do is to be able to slide SiO2(aq) from 1 umol to SiO2(am) saturation at constant pH (stabilized with a buffer e.g. TRIS) while calculating the initial reaction rate at each step for a silicate glass. I don't seem to be able to get beyond this error message even with a simple solution and no glass reacting just the simple solution from above. Thanks for your help.
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